In today’s world people latch onto others that have more than they do and question why the person has it and they don’t. This line’s Biblical reference gives the line it’s emphasis.
When the Great Flood came, Noah built the arc and saved all the animal species of the world alongside himself, aka the human race.
Playing on the ignorance of people, if we are thirsty, we are want to be / asking to be refreshed, hence the great flood.
BUT
People are so needy of God and expectant of things they haven’t earned they get their facts messed up. They say we hope we get what we’ve been waiting for/deserve, whether it be God to save us or the money other people have that we don’t. We ask God to come back with the money he owes us as if he made money or had anything to do with it.
The play on words is “M’s that he owes us”;
which could be taken as millions of $$
or
Moses, M’s that he owes us
(M-owes-us)
But Moses wasn’t the one who saved the world from the Great Flood so in being wrong on accident it’s obvious to God that people aren’t listening to the supposed stories he left for their enlightenment, but are more so worried about their own material gains.